Level Select, All Weapons and More
Enter the password "ND SC VR D CH T" (that's UNDISCOVERED CHEAT with spaces instead of vowels.) You can now select any mission, have a full character roster, all weapons researched and all characters with level 3 cybernetics.
These passwords start you in a harder game with less money.
ROBOTS Starts in Indonesia, first misson in western Australia
COOLBODY Starts in Paraguay, first mission in Uruguay
FLIGHT Starts in weatern Australia, first mission in Northern Territories or New South Wales
BCHHLL Starts in Kenya, first mission in Zaire or Mozambique